19640944902 has 16 divisors (see below), whose sum is σ = 39299715072. Its totient is φ = 6544010760.

The previous prime is 19640944861. The next prime is 19640944903. The reversal of 19640944902 is 20944904691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19640944903) 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, 728374 + ... + 754857.

It is an arithmetic number, because the mean of its divisors is an integer number (2456232192).

Almost surely, 2^19640944902 is an apocalyptic number.

19640944902 is an abundant number, since it is smaller than the sum of its proper divisors (19658770170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19640944902 is a wasteful number, since it uses less digits than its factorization.

19640944902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485443.

The product of its (nonzero) digits is 559872, while the sum is 48.

The spelling of 19640944902 in words is "nineteen billion, six hundred forty million, nine hundred forty-four thousand, nine hundred two".