31266551561 has 16 divisors (see below), whose sum is σ = 36473712000. Its totient is φ = 26791624944.

The previous prime is 31266551557. The next prime is 31266551567. The reversal of 31266551561 is 16515566213.

It is not a de Polignac number, because 31266551561 - 2² = 31266551557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31266551567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1268210 + ... + 1292628.

It is an arithmetic number, because the mean of its divisors is an integer number (2279607000).

Almost surely, 2^31266551561 is an apocalyptic number.

It is an amenable number.

31266551561 is a deficient number, since it is larger than the sum of its proper divisors (5207160439).

31266551561 is an equidigital number, since it uses as much as digits as its factorization.

31266551561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28173 (or 28159 counting only the distinct ones).

The product of its digits is 162000, while the sum is 41.

The spelling of 31266551561 in words is "thirty-one billion, two hundred sixty-six million, five hundred fifty-one thousand, five hundred sixty-one".