1636545138 has 16 divisors (see below), whose sum is σ = 3273828096. Its totient is φ = 545392080.

The previous prime is 1636545121. The next prime is 1636545181. The reversal of 1636545138 is 8315456361.

It is a super-2 number, since 2×1636545138² = 5356559977422878088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1636545138.

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, 543 + ... + 57213.

It is an arithmetic number, because the mean of its divisors is an integer number (204614256).

Almost surely, 2^1636545138 is an apocalyptic number.

1636545138 is an abundant number, since it is smaller than the sum of its proper divisors (1637282958).

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

1636545138 is a wasteful number, since it uses less digits than its factorization.

1636545138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61489.

The product of its digits is 259200, while the sum is 42.

The square root of 1636545138 is about 40454.2351058576. The cubic root of 1636545138 is about 1178.4450307118.

The spelling of 1636545138 in words is "one billion, six hundred thirty-six million, five hundred forty-five thousand, one hundred thirty-eight".