165065261400 has 192 divisors, whose sum is σ = 612293623200. Its totient is φ = 40631431680.

The previous prime is 165065261371. The next prime is 165065261401. The reversal of 165065261400 is 4162560561.

165065261400 is a `hidden beast` number, since 1 + 6 + 506 + 5 + 2 + 6 + 140 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165065261401) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1105479 + ... + 1245878.

Almost surely, 2^165065261400 is an apocalyptic number.

165065261400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165065261400 is an abundant number, since it is smaller than the sum of its proper divisors (447228361800).

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

165065261400 is a wasteful number, since it uses less digits than its factorization.

165065261400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2351395 (or 2351380 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 165065261400 in words is "one hundred sixty-five billion, sixty-five million, two hundred sixty-one thousand, four hundred".