661612050615 has 16 divisors (see below), whose sum is σ = 1058651582688. Its totient is φ = 352835659776.

The previous prime is 661612050611. The next prime is 661612050629. The reversal of 661612050615 is 516050216166.

661612050615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661612050615 - 2² = 661612050611 is a prime.

It is a super-3 number, since 3×661612050615³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661612050611) 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, 1278234 + ... + 1719623.

It is an arithmetic number, because the mean of its divisors is an integer number (66165723918).

Almost surely, 2^661612050615 is an apocalyptic number.

661612050615 is a deficient number, since it is larger than the sum of its proper divisors (397039532073).

661612050615 is a wasteful number, since it uses less digits than its factorization.

661612050615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3012578.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 661612050615 in words is "six hundred sixty-one billion, six hundred twelve million, fifty thousand, six hundred fifteen".