51691153013 has 4 divisors (see below), whose sum is σ = 51694316160. Its totient is φ = 51687989868.

The previous prime is 51691153001. The next prime is 51691153021. The reversal of 51691153013 is 31035119615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51691153013 - 2¹² = 51691148917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51691153093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1556933 + ... + 1589786.

It is an arithmetic number, because the mean of its divisors is an integer number (12923579040).

Almost surely, 2^51691153013 is an apocalyptic number.

It is an amenable number.

51691153013 is a deficient number, since it is larger than the sum of its proper divisors (3163147).

51691153013 is a wasteful number, since it uses less digits than its factorization.

51691153013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3163146.

The product of its (nonzero) digits is 12150, while the sum is 35.

The spelling of 51691153013 in words is "fifty-one billion, six hundred ninety-one million, one hundred fifty-three thousand, thirteen".