1266002501565 has 16 divisors (see below), whose sum is σ = 2026503925056. Its totient is φ = 674901360000.

The previous prime is 1266002501551. The next prime is 1266002501567. The reversal of 1266002501565 is 5651052006621.

It is a happy number.

It is not a de Polignac number, because 1266002501565 - 2¹⁹ = 1266001977277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266002501567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18713496 + ... + 18781025.

It is an arithmetic number, because the mean of its divisors is an integer number (126656495316).

Almost surely, 2^{1266002501565} is an apocalyptic number.

1266002501565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1266002501565 is a deficient number, since it is larger than the sum of its proper divisors (760501423491).

1266002501565 is a wasteful number, since it uses less digits than its factorization.

1266002501565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37496780.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 1266002501565 in words is "one trillion, two hundred sixty-six billion, two million, five hundred one thousand, five hundred sixty-five".