155172069738 has 48 divisors (see below), whose sum is σ = 394107247680. Its totient is φ = 44332688880.

The previous prime is 155172069737. The next prime is 155172069791. The reversal of 155172069738 is 837960271551.

155172069738 is a `hidden beast` number, since 1 + 5 + 517 + 2 + 0 + 6 + 97 + 38 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155172069733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7648528 + ... + 7668788.

It is an arithmetic number, because the mean of its divisors is an integer number (8210567660).

Almost surely, 2^155172069738 is an apocalyptic number.

155172069738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

155172069738 is an abundant number, since it is smaller than the sum of its proper divisors (238935177942).

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

155172069738 is an frugal number, since it uses more digits than its factorization.

155172069738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40540 (or 20273 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 54.

The spelling of 155172069738 in words is "one hundred fifty-five billion, one hundred seventy-two million, sixty-nine thousand, seven hundred thirty-eight".