1265538891530 has 32 divisors (see below), whose sum is σ = 2316598610688. Its totient is φ = 497671820800.

The previous prime is 1265538891499. The next prime is 1265538891571. The reversal of 1265538891530 is 351988355621.

It is a super-2 number, since 2×1265538891530² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2274086 + ... + 2775345.

It is an arithmetic number, because the mean of its divisors is an integer number (72393706584).

Almost surely, 2^{1265538891530} is an apocalyptic number.

1265538891530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265538891530 is a deficient number, since it is larger than the sum of its proper divisors (1051059719158).

1265538891530 is a wasteful number, since it uses less digits than its factorization.

1265538891530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5049862.

The product of its (nonzero) digits is 7776000, while the sum is 56.

The spelling of 1265538891530 in words is "one trillion, two hundred sixty-five billion, five hundred thirty-eight million, eight hundred ninety-one thousand, five hundred thirty".