1251532215155 has 8 divisors (see below), whose sum is σ = 1501859852784. Its totient is φ = 1001211642400.

The previous prime is 1251532215137. The next prime is 1251532215161. The reversal of 1251532215155 is 5515122351521.

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

It is a de Polignac number, because none of the positive numbers 2^k-1251532215155 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1368341 + ... + 2091750.

It is an arithmetic number, because the mean of its divisors is an integer number (187732481598).

Almost surely, 2^{1251532215155} is an apocalyptic number.

1251532215155 is a deficient number, since it is larger than the sum of its proper divisors (250327637629).

1251532215155 is an equidigital number, since it uses as much as digits as its factorization.

1251532215155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3532437.

The product of its digits is 75000, while the sum is 38.

Adding to 1251532215155 its reverse (5515122351521), we get a palindrome (6766654566676).

The spelling of 1251532215155 in words is "one trillion, two hundred fifty-one billion, five hundred thirty-two million, two hundred fifteen thousand, one hundred fifty-five".