1990636357535 has 16 divisors (see below), whose sum is σ = 2730214080000. Its totient is φ = 1364908536096.

The previous prime is 1990636357487. The next prime is 1990636357543. The reversal of 1990636357535 is 5357536360991.

It is a happy number.

It is not a de Polignac number, because 1990636357535 - 2²⁸ = 1990367922079 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1577885 + ... + 2543814.

It is an arithmetic number, because the mean of its divisors is an integer number (170638380000).

Almost surely, 2^{1990636357535} is an apocalyptic number.

1990636357535 is a deficient number, since it is larger than the sum of its proper divisors (739577722465).

1990636357535 is a wasteful number, since it uses less digits than its factorization.

1990636357535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4135510.

The product of its (nonzero) digits is 68890500, while the sum is 62.

The spelling of 1990636357535 in words is "one trillion, nine hundred ninety billion, six hundred thirty-six million, three hundred fifty-seven thousand, five hundred thirty-five".