155715172049 has 16 divisors (see below), whose sum is σ = 167678208000. Its totient is φ = 144139389264.

The previous prime is 155715172009. The next prime is 155715172057. The reversal of 155715172049 is 940271517551.

It is a cyclic number.

It is not a de Polignac number, because 155715172049 - 2²⁴ = 155698394833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155715171994 and 155715172012.

It is not an unprimeable number, because it can be changed into a prime (155715172009) 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 15 ways as a sum of consecutive naturals, for example, 389354 + ... + 680460.

It is an arithmetic number, because the mean of its divisors is an integer number (10479888000).

Almost surely, 2^155715172049 is an apocalyptic number.

155715172049 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

155715172049 is a deficient number, since it is larger than the sum of its proper divisors (11963035951).

155715172049 is a wasteful number, since it uses less digits than its factorization.

155715172049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291772.

The product of its (nonzero) digits is 441000, while the sum is 47.

The spelling of 155715172049 in words is "one hundred fifty-five billion, seven hundred fifteen million, one hundred seventy-two thousand, forty-nine".