19551371040 has 72 divisors (see below), whose sum is σ = 66719058588. Its totient is φ = 5213698560.

The previous prime is 19551371039. The next prime is 19551371057. The reversal of 19551371040 is 4017315591.

It is a happy number.

19551371040 is a `hidden beast` number, since 1 + 95 + 513 + 7 + 10 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 18835915536 + 715455504 = 137244^2 + 26748^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×19551371040² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19551370986 and 19551371004.

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, 6787231 + ... + 6790110.

Almost surely, 2^19551371040 is an apocalyptic number.

19551371040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19551371040 is an abundant number, since it is smaller than the sum of its proper divisors (47167687548).

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

19551371040 is a wasteful number, since it uses less digits than its factorization.

19551371040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13577362 (or 13577351 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The spelling of 19551371040 in words is "nineteen billion, five hundred fifty-one million, three hundred seventy-one thousand, forty".