661355253116 has 12 divisors (see below), whose sum is σ = 1157625145488. Its totient is φ = 330605211552.

The previous prime is 661355253107. The next prime is 661355253131. The reversal of 661355253116 is 611352553166.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18083201 + ... + 18119736.

It is an arithmetic number, because the mean of its divisors is an integer number (96468762124).

Almost surely, 2^661355253116 is an apocalyptic number.

It is an amenable number.

661355253116 is a deficient number, since it is larger than the sum of its proper divisors (496269892372).

661355253116 is a wasteful number, since it uses less digits than its factorization.

661355253116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36207508 (or 36207506 counting only the distinct ones).

The product of its digits is 486000, while the sum is 44.

The spelling of 661355253116 in words is "six hundred sixty-one billion, three hundred fifty-five million, two hundred fifty-three thousand, one hundred sixteen".