19878057954 has 24 divisors (see below), whose sum is σ = 43132210992. Its totient is φ = 6616313880.

The previous prime is 19878057949. The next prime is 19878057977. The reversal of 19878057954 is 45975087891.

19878057954 is a `hidden beast` number, since 1 + 9 + 8 + 7 + 8 + 0 + 579 + 54 = 666.

It is a super-2 number, since 2×19878057954² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19878057891 and 19878057900.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 796152 + ... + 820739.

It is an arithmetic number, because the mean of its divisors is an integer number (1797175458).

Almost surely, 2^19878057954 is an apocalyptic number.

19878057954 is an abundant number, since it is smaller than the sum of its proper divisors (23254153038).

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

19878057954 is a wasteful number, since it uses less digits than its factorization.

19878057954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617582 (or 1617579 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 63.

The spelling of 19878057954 in words is "nineteen billion, eight hundred seventy-eight million, fifty-seven thousand, nine hundred fifty-four".