1215154113657 has 8 divisors (see below), whose sum is σ = 1767496892640. Its totient is φ = 736457038560.

The previous prime is 1215154113599. The next prime is 1215154113661. The reversal of 1215154113657 is 7563114515121.

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

It is not a de Polignac number, because 1215154113657 - 2⁸ = 1215154113401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215154113697) 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, 18411425932 + ... + 18411425997.

It is an arithmetic number, because the mean of its divisors is an integer number (220937111580).

Almost surely, 2^{1215154113657} is an apocalyptic number.

It is an amenable number.

1215154113657 is a deficient number, since it is larger than the sum of its proper divisors (552342778983).

1215154113657 is a wasteful number, since it uses less digits than its factorization.

1215154113657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36822851943.

The product of its digits is 126000, while the sum is 42.

Adding to 1215154113657 its reverse (7563114515121), we get a palindrome (8778268628778).

The spelling of 1215154113657 in words is "one trillion, two hundred fifteen billion, one hundred fifty-four million, one hundred thirteen thousand, six hundred fifty-seven".