155597121795551 has 8 divisors (see below), whose sum is σ = 159437727330000. Its totient is φ = 151758685488960.

The previous prime is 155597121795547. The next prime is 155597121795631.

155597121795551 is nontrivially palindromic in base 10.

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 155597121795551 - 2² = 155597121795547 is a prime.

It is a super-2 number, since 2×155597121795551² (a number of 29 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 (155597121795541) 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, 542161736 + ... + 542448653.

It is an arithmetic number, because the mean of its divisors is an integer number (19929715916250).

Almost surely, 2^{155597121795551} is an apocalyptic number.

155597121795551 is a deficient number, since it is larger than the sum of its proper divisors (3840605534449).

155597121795551 is a wasteful number, since it uses less digits than its factorization.

155597121795551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084613929.

The product of its digits is 124031250, while the sum is 68.

The spelling of 155597121795551 in words is "one hundred fifty-five trillion, five hundred ninety-seven billion, one hundred twenty-one million, seven hundred ninety-five thousand, five hundred fifty-one".