155615105551 has 8 divisors (see below), whose sum is σ = 158577607440. Its totient is φ = 152653580352.

The previous prime is 155615105543. The next prime is 155615105573. The reversal of 155615105551 is 155501516551.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 155615105551 - 2³ = 155615105543 is a prime.

It is a super-2 number, since 2×155615105551² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155615105951) 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, 81616 + ... + 563818.

It is an arithmetic number, because the mean of its divisors is an integer number (19822200930).

Almost surely, 2^155615105551 is an apocalyptic number.

155615105551 is a deficient number, since it is larger than the sum of its proper divisors (2962501889).

155615105551 is an equidigital number, since it uses as much as digits as its factorization.

155615105551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488345.

The product of its (nonzero) digits is 93750, while the sum is 40.

The spelling of 155615105551 in words is "one hundred fifty-five billion, six hundred fifteen million, one hundred five thousand, five hundred fifty-one".