191215734144 has 64 divisors (see below), whose sum is σ = 507964063680. Its totient is φ = 63732646400.

The previous prime is 191215734131. The next prime is 191215734169. The reversal of 191215734144 is 441437512191.

It is a tau number, because it is divible by the number of its divisors (64).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 191215734096 and 191215734105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6486799 + ... + 6516209.

It is an arithmetic number, because the mean of its divisors is an integer number (7936938495).

Almost surely, 2^191215734144 is an apocalyptic number.

It is an amenable number.

191215734144 is an abundant number, since it is smaller than the sum of its proper divisors (316748329536).

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

191215734144 is a wasteful number, since it uses less digits than its factorization.

191215734144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46359 (or 46347 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The spelling of 191215734144 in words is "one hundred ninety-one billion, two hundred fifteen million, seven hundred thirty-four thousand, one hundred forty-four".