1015640645431 has 4 divisors (see below), whose sum is σ = 1015646214592. Its totient is φ = 1015635076272.

The previous prime is 1015640645423. The next prime is 1015640645471. The reversal of 1015640645431 is 1345460465101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1015640645431 - 2³ = 1015640645423 is a prime.

It is a super-2 number, since 2×1015640645431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1015640645471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2501430 + ... + 2878963.

It is an arithmetic number, because the mean of its divisors is an integer number (253911553648).

Almost surely, 2^{1015640645431} is an apocalyptic number.

1015640645431 is a deficient number, since it is larger than the sum of its proper divisors (5569161).

1015640645431 is an equidigital number, since it uses as much as digits as its factorization.

1015640645431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5569160.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 1015640645431 in words is "one trillion, fifteen billion, six hundred forty million, six hundred forty-five thousand, four hundred thirty-one".