1261200161515 has 32 divisors (see below), whose sum is σ = 1844757742464. Its totient is φ = 808009728000.

The previous prime is 1261200161461. The next prime is 1261200161563. The reversal of 1261200161515 is 5151610021621.

It is not a de Polignac number, because 1261200161515 - 2⁷ = 1261200161387 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7654486 + ... + 7817515.

It is an arithmetic number, because the mean of its divisors is an integer number (57648679452).

Almost surely, 2^{1261200161515} is an apocalyptic number.

1261200161515 is a deficient number, since it is larger than the sum of its proper divisors (583557580949).

1261200161515 is a wasteful number, since it uses less digits than its factorization.

1261200161515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15472167.

The product of its (nonzero) digits is 3600, while the sum is 31.

The spelling of 1261200161515 in words is "one trillion, two hundred sixty-one billion, two hundred million, one hundred sixty-one thousand, five hundred fifteen".