19145149956 has 45 divisors (see below), whose sum is σ = 50055715479. Its totient is φ = 6380886456.

The previous prime is 19145149943. The next prime is 19145149963. The reversal of 19145149956 is 65994154191.

The square root of 19145149956 is 138366.

It is a perfect power (a square), and thus also a powerful number.

19145149956 is a `hidden beast` number, since 1 + 9 + 145 + 1 + 499 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2486745 + ... + 2494431.

Almost surely, 2^19145149956 is an apocalyptic number.

19145149956 is the 138366-th square number.

It is an amenable number.

19145149956 is an abundant number, since it is smaller than the sum of its proper divisors (30910565523).

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

19145149956 is an frugal number, since it uses more digits than its factorization.

19145149956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15390 (or 7692 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 54.

The spelling of 19145149956 in words is "nineteen billion, one hundred forty-five million, one hundred forty-nine thousand, nine hundred fifty-six".