1265897157 has 8 divisors (see below), whose sum is σ = 1928986176. Its totient is φ = 723369792.

The previous prime is 1265897131. The next prime is 1265897203. The reversal of 1265897157 is 7517985621.

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

It is not a de Polignac number, because 1265897157 - 2⁷ = 1265897029 is a prime.

It is a super-2 number, since 2×1265897157² = 3204991224201365298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265897117) 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, 30140388 + ... + 30140429.

It is an arithmetic number, because the mean of its divisors is an integer number (241123272).

Almost surely, 2^1265897157 is an apocalyptic number.

It is an amenable number.

1265897157 is a deficient number, since it is larger than the sum of its proper divisors (663089019).

1265897157 is an equidigital number, since it uses as much as digits as its factorization.

1265897157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60280827.

The product of its digits is 1058400, while the sum is 51.

The square root of 1265897157 is about 35579.4485201780. The cubic root of 1265897157 is about 1081.7647066558.

The spelling of 1265897157 in words is "one billion, two hundred sixty-five million, eight hundred ninety-seven thousand, one hundred fifty-seven".