515366505661 has 12 divisors (see below), whose sum is σ = 599589292800. Its totient is φ = 441682801560.

The previous prime is 515366505637. The next prime is 515366505673. The reversal of 515366505661 is 166505663515.

It is not a de Polignac number, because 515366505661 - 2⁵ = 515366505629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (515366505601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346461 + ... + 1072738.

It is an arithmetic number, because the mean of its divisors is an integer number (49965774400).

Almost surely, 2^515366505661 is an apocalyptic number.

It is an amenable number.

515366505661 is a deficient number, since it is larger than the sum of its proper divisors (84222787139).

515366505661 is a wasteful number, since it uses less digits than its factorization.

515366505661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426624 (or 1426617 counting only the distinct ones).

The product of its (nonzero) digits is 2430000, while the sum is 49.

The spelling of 515366505661 in words is "five hundred fifteen billion, three hundred sixty-six million, five hundred five thousand, six hundred sixty-one".