646425260031 has 4 divisors (see below), whose sum is σ = 861900346712. Its totient is φ = 430950173352.

The previous prime is 646425260027. The next prime is 646425260053. The reversal of 646425260031 is 130062524646.

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

It is not a de Polignac number, because 646425260031 - 2² = 646425260027 is a prime.

It is a super-2 number, since 2×646425260031² (a number of 24 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 (646425260011) 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, 107737543336 + ... + 107737543341.

It is an arithmetic number, because the mean of its divisors is an integer number (215475086678).

Almost surely, 2^646425260031 is an apocalyptic number.

646425260031 is a deficient number, since it is larger than the sum of its proper divisors (215475086681).

646425260031 is a wasteful number, since it uses less digits than its factorization.

646425260031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215475086680.

The product of its (nonzero) digits is 207360, while the sum is 39.

Adding to 646425260031 its reverse (130062524646), we get a palindrome (776487784677).

The spelling of 646425260031 in words is "six hundred forty-six billion, four hundred twenty-five million, two hundred sixty thousand, thirty-one".