64840426902406 has 16 divisors (see below), whose sum is σ = 97538965488864. Its totient is φ = 32327443678464.

The previous prime is 64840426902389. The next prime is 64840426902409. The reversal of 64840426902406 is 60420962404846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64840426902409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23633551 + ... + 26234053.

It is an arithmetic number, because the mean of its divisors is an integer number (6096185343054).

Almost surely, 2^{64840426902406} is an apocalyptic number.

64840426902406 is a deficient number, since it is larger than the sum of its proper divisors (32698538586458).

64840426902406 is a wasteful number, since it uses less digits than its factorization.

64840426902406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636175.

The product of its (nonzero) digits is 15925248, while the sum is 55.

The spelling of 64840426902406 in words is "sixty-four trillion, eight hundred forty billion, four hundred twenty-six million, nine hundred two thousand, four hundred six".