1155355405251 has 8 divisors (see below), whose sum is σ = 1540893521664. Its totient is φ = 770027112840.

The previous prime is 1155355405247. The next prime is 1155355405277. The reversal of 1155355405251 is 1525045535511.

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

It is not a de Polignac number, because 1155355405251 - 2² = 1155355405247 is a prime.

It is a super-2 number, since 2×1155355405251² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1155355405291) 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, 52443151 + ... + 52465176.

It is an arithmetic number, because the mean of its divisors is an integer number (192611690208).

Almost surely, 2^{1155355405251} is an apocalyptic number.

1155355405251 is a deficient number, since it is larger than the sum of its proper divisors (385538116413).

1155355405251 is a wasteful number, since it uses less digits than its factorization.

1155355405251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104912001.

The product of its (nonzero) digits is 375000, while the sum is 42.

The spelling of 1155355405251 in words is "one trillion, one hundred fifty-five billion, three hundred fifty-five million, four hundred five thousand, two hundred fifty-one".