1999101837402 has 12 divisors (see below), whose sum is σ = 4331387314410. Its totient is φ = 666367279128.

The previous prime is 1999101837391. The next prime is 1999101837449. The reversal of 1999101837402 is 2047381019991.

1999101837402 is a `hidden beast` number, since 19 + 99 + 101 + 8 + 37 + 402 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1918809514521 + 80292322881 = 1385211^2 + 283359^2 .

It is a super-2 number, since 2×1999101837402² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55530606577 + ... + 55530606612.

Almost surely, 2^{1999101837402} is an apocalyptic number.

1999101837402 is an abundant number, since it is smaller than the sum of its proper divisors (2332285477008).

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

1999101837402 is a wasteful number, since it uses less digits than its factorization.

1999101837402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111061213197 (or 111061213194 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The spelling of 1999101837402 in words is "one trillion, nine hundred ninety-nine billion, one hundred one million, eight hundred thirty-seven thousand, four hundred two".