61519664 has 20 divisors (see below), whose sum is σ = 124377456. Its totient is φ = 29422272.

The previous prime is 61519637. The next prime is 61519691. The reversal of 61519664 is 46691516.

It is an interprime number because it is at equal distance from previous prime (61519637) and next prime (61519691).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83219 + ... + 83954.

Almost surely, 2^61519664 is an apocalyptic number.

It is an amenable number.

61519664 is an abundant number, since it is smaller than the sum of its proper divisors (62857792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61519664 is a wasteful number, since it uses less digits than its factorization.

61519664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167204 (or 167198 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 61519664 is about 7843.4472013267. The cubic root of 61519664 is about 394.7644036509.

The spelling of 61519664 in words is "sixty-one million, five hundred nineteen thousand, six hundred sixty-four".