648021401586931 has 4 divisors (see below), whose sum is σ = 648123887976552. Its totient is φ = 647918915197312.

The previous prime is 648021401586919. The next prime is 648021401586941. The reversal of 648021401586931 is 139685104120846.

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 648021401586931 - 2²⁹ = 648020864716019 is a prime.

It is a super-2 number, since 2×648021401586931² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648021401586941) 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, 51243185326 + ... + 51243197971.

It is an arithmetic number, because the mean of its divisors is an integer number (162030971994138).

Almost surely, 2^{648021401586931} is an apocalyptic number.

648021401586931 is a deficient number, since it is larger than the sum of its proper divisors (102486389621).

648021401586931 is a wasteful number, since it uses less digits than its factorization.

648021401586931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102486389620.

The product of its (nonzero) digits is 9953280, while the sum is 58.

The spelling of 648021401586931 in words is "six hundred forty-eight trillion, twenty-one billion, four hundred one million, five hundred eighty-six thousand, nine hundred thirty-one".