161255772135 has 32 divisors (see below), whose sum is σ = 303540281280. Its totient is φ = 80944072704.

The previous prime is 161255772113. The next prime is 161255772149. The reversal of 161255772135 is 531277552161.

161255772135 is a `hidden beast` number, since 1 + 6 + 1 + 25 + 577 + 21 + 35 = 666.

It is not a de Polignac number, because 161255772135 - 2⁶ = 161255772071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 35129682 + ... + 35134271.

It is an arithmetic number, because the mean of its divisors is an integer number (9485633790).

Almost surely, 2^161255772135 is an apocalyptic number.

161255772135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161255772135 is a deficient number, since it is larger than the sum of its proper divisors (142284509145).

161255772135 is a wasteful number, since it uses less digits than its factorization.

161255772135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70263984 (or 70263978 counting only the distinct ones).

The product of its digits is 441000, while the sum is 45.

The spelling of 161255772135 in words is "one hundred sixty-one billion, two hundred fifty-five million, seven hundred seventy-two thousand, one hundred thirty-five".