19430918640 has 180 divisors, whose sum is σ = 75909599064. Its totient is φ = 4441344768.

The previous prime is 19430918629. The next prime is 19430918657. The reversal of 19430918640 is 4681903491.

19430918640 is a `hidden beast` number, since 19 + 430 + 91 + 86 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 240102 + ... + 310661.

Almost surely, 2^19430918640 is an apocalyptic number.

19430918640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19430918640 is an abundant number, since it is smaller than the sum of its proper divisors (56478680424).

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

19430918640 is a wasteful number, since it uses less digits than its factorization.

19430918640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550796 (or 550780 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 19430918640 in words is "nineteen billion, four hundred thirty million, nine hundred eighteen thousand, six hundred forty".