51549970461 has 16 divisors (see below), whose sum is σ = 75088772928. Its totient is φ = 31197824000.

The previous prime is 51549970457. The next prime is 51549970471. The reversal of 51549970461 is 16407994515.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51549970461 - 2² = 51549970457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51549970411) 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, 1091076 + ... + 1137341.

It is an arithmetic number, because the mean of its divisors is an integer number (4693048308).

Almost surely, 2^51549970461 is an apocalyptic number.

It is an amenable number.

51549970461 is a deficient number, since it is larger than the sum of its proper divisors (23538802467).

51549970461 is a wasteful number, since it uses less digits than its factorization.

51549970461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229132.

The product of its (nonzero) digits is 1360800, while the sum is 51.

The spelling of 51549970461 in words is "fifty-one billion, five hundred forty-nine million, nine hundred seventy thousand, four hundred sixty-one".