1636135367640 has 128 divisors (see below), whose sum is σ = 5197972124160. Its totient is φ = 410571823104.

The previous prime is 1636135367639. The next prime is 1636135367663. The reversal of 1636135367640 is 467635316361.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13294629 + ... + 13417131.

It is an arithmetic number, because the mean of its divisors is an integer number (40609157220).

Almost surely, 2^{1636135367640} is an apocalyptic number.

1636135367640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1636135367640 is an abundant number, since it is smaller than the sum of its proper divisors (3561836756520).

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

1636135367640 is a wasteful number, since it uses less digits than its factorization.

1636135367640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129081 (or 129077 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 51.

The spelling of 1636135367640 in words is "one trillion, six hundred thirty-six billion, one hundred thirty-five million, three hundred sixty-seven thousand, six hundred forty".