1635165138 has 16 divisors (see below), whose sum is σ = 3307076640. Its totient is φ = 538930656.

The previous prime is 1635165131. The next prime is 1635165139. The reversal of 1635165138 is 8315615361.

It is a junction number, because it is equal to n+sod(n) for n = 1635165096 and 1635165105.

It is not an unprimeable number, because it can be changed into a prime (1635165131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1530520 + ... + 1531587.

It is an arithmetic number, because the mean of its divisors is an integer number (206692290).

Almost surely, 2^1635165138 is an apocalyptic number.

1635165138 is an abundant number, since it is smaller than the sum of its proper divisors (1671911502).

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

1635165138 is a wasteful number, since it uses less digits than its factorization.

1635165138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3062201.

The product of its digits is 64800, while the sum is 39.

The square root of 1635165138 is about 40437.1751980773. The cubic root of 1635165138 is about 1178.1137003121.

The spelling of 1635165138 in words is "one billion, six hundred thirty-five million, one hundred sixty-five thousand, one hundred thirty-eight".