661426600375 has 16 divisors (see below), whose sum is σ = 825491092608. Its totient is φ = 529121604000.

The previous prime is 661426600363. The next prime is 661426600423. The reversal of 661426600375 is 573006624166.

It is a de Polignac number, because none of the positive numbers 2^k-661426600375 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 3935565 + ... + 4100185.

It is an arithmetic number, because the mean of its divisors is an integer number (51593193288).

Almost surely, 2^661426600375 is an apocalyptic number.

661426600375 is a deficient number, since it is larger than the sum of its proper divisors (164064492233).

661426600375 is a wasteful number, since it uses less digits than its factorization.

661426600375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196779 (or 196769 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 661426600375 in words is "six hundred sixty-one billion, four hundred twenty-six million, six hundred thousand, three hundred seventy-five".