645256155005 has 64 divisors (see below), whose sum is σ = 1008522067968. Its totient is φ = 384298632960.

The previous prime is 645256155001. The next prime is 645256155013. The reversal of 645256155005 is 500551652546.

It is not a de Polignac number, because 645256155005 - 2² = 645256155001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645256155001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7599647 + ... + 7684083.

It is an arithmetic number, because the mean of its divisors is an integer number (15758157312).

Almost surely, 2^645256155005 is an apocalyptic number.

It is an amenable number.

645256155005 is a deficient number, since it is larger than the sum of its proper divisors (363265912963).

645256155005 is a wasteful number, since it uses less digits than its factorization.

645256155005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85346.

The product of its (nonzero) digits is 900000, while the sum is 44.

The spelling of 645256155005 in words is "six hundred forty-five billion, two hundred fifty-six million, one hundred fifty-five thousand, five".