261515505602 has 32 divisors (see below), whose sum is σ = 441590728320. Its totient is φ = 115248608640.

The previous prime is 261515505599. The next prime is 261515505607. The reversal of 261515505602 is 206505515162.

It is not an unprimeable number, because it can be changed into a prime (261515505607) 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, 44024 + ... + 724547.

It is an arithmetic number, because the mean of its divisors is an integer number (13799710260).

Almost surely, 2^261515505602 is an apocalyptic number.

261515505602 is a deficient number, since it is larger than the sum of its proper divisors (180075222718).

261515505602 is a wasteful number, since it uses less digits than its factorization.

261515505602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769178.

The product of its (nonzero) digits is 90000, while the sum is 38.

The spelling of 261515505602 in words is "two hundred sixty-one billion, five hundred fifteen million, five hundred five thousand, six hundred two".