64021542494 has 64 divisors (see below), whose sum is σ = 119829338496. Its totient is φ = 24978530304.

The previous prime is 64021542493. The next prime is 64021542523. The reversal of 64021542494 is 49424512046.

It is a super-2 number, since 2×64021542494² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64021542493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5166434 + ... + 5178810.

It is an arithmetic number, because the mean of its divisors is an integer number (1872333414).

Almost surely, 2^64021542494 is an apocalyptic number.

64021542494 is a deficient number, since it is larger than the sum of its proper divisors (55807796002).

64021542494 is a wasteful number, since it uses less digits than its factorization.

64021542494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12789.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 64021542494 in words is "sixty-four billion, twenty-one million, five hundred forty-two thousand, four hundred ninety-four".