1915561079940 has 48 divisors (see below), whose sum is σ = 5363637108480. Its totient is φ = 510809994240.

The previous prime is 1915561079921. The next prime is 1915561079951. The reversal of 1915561079940 is 499701655191.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6729300 + ... + 7008180.

It is an arithmetic number, because the mean of its divisors is an integer number (111742439760).

Almost surely, 2^{1915561079940} is an apocalyptic number.

1915561079940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1915561079940 is an abundant number, since it is smaller than the sum of its proper divisors (3448076028540).

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

1915561079940 is a wasteful number, since it uses less digits than its factorization.

1915561079940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393372 (or 393370 counting only the distinct ones).

The product of its (nonzero) digits is 3061800, while the sum is 57.

The spelling of 1915561079940 in words is "one trillion, nine hundred fifteen billion, five hundred sixty-one million, seventy-nine thousand, nine hundred forty".