661262027 has 2 divisors, whose sum is σ = 661262028. Its totient is φ = 661262026.

The previous prime is 661261999. The next prime is 661262047. The reversal of 661262027 is 720262166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661262027 - 2¹⁴ = 661245643 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661261984 and 661262002.

It is not a weakly prime, because it can be changed into another prime (661262047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330631013 + 330631014.

It is an arithmetic number, because the mean of its divisors is an integer number (330631014).

Almost surely, 2^661262027 is an apocalyptic number.

661262027 is a deficient number, since it is larger than the sum of its proper divisors (1).

661262027 is an equidigital number, since it uses as much as digits as its factorization.

661262027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 661262027 is about 25715.0155940065. The cubic root of 661262027 is about 871.2133626828.

The spelling of 661262027 in words is "six hundred sixty-one million, two hundred sixty-two thousand, twenty-seven".