661141470 has 32 divisors (see below), whose sum is σ = 1730989440. Its totient is φ = 160276640.

The previous prime is 661141409. The next prime is 661141483. The reversal of 661141470 is 74141166.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1001400 + ... + 1002059.

It is an arithmetic number, because the mean of its divisors is an integer number (54093420).

Almost surely, 2^661141470 is an apocalyptic number.

661141470 is an abundant number, since it is smaller than the sum of its proper divisors (1069847970).

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

661141470 is a wasteful number, since it uses less digits than its factorization.

661141470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2003480.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 661141470 is about 25712.6713898031. The cubic root of 661141470 is about 871.1604148101.

The spelling of 661141470 in words is "six hundred sixty-one million, one hundred forty-one thousand, four hundred seventy".