661355253115 has 16 divisors (see below), whose sum is σ = 801691228800. Its totient is φ = 523719770112.

The previous prime is 661355253107. The next prime is 661355253131. The reversal of 661355253115 is 511352553166.

It is a cyclic number.

It is not a de Polignac number, because 661355253115 - 2³ = 661355253107 is a prime.

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, 326595 + ... + 1195564.

It is an arithmetic number, because the mean of its divisors is an integer number (50105701800).

Almost surely, 2^661355253115 is an apocalyptic number.

661355253115 is a deficient number, since it is larger than the sum of its proper divisors (140335975685).

661355253115 is a wasteful number, since it uses less digits than its factorization.

661355253115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523046.

The product of its digits is 405000, while the sum is 43.

The spelling of 661355253115 in words is "six hundred sixty-one billion, three hundred fifty-five million, two hundred fifty-three thousand, one hundred fifteen".