51450697465 has 4 divisors (see below), whose sum is σ = 61740836964. Its totient is φ = 41160557968.

The previous prime is 51450697453. The next prime is 51450697471. The reversal of 51450697465 is 56479605415.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14011930384 + 37438767081 = 118372^2 + 193491^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51450697465 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5145069742 + ... + 5145069751.

It is an arithmetic number, because the mean of its divisors is an integer number (15435209241).

Almost surely, 2^51450697465 is an apocalyptic number.

It is an amenable number.

51450697465 is a deficient number, since it is larger than the sum of its proper divisors (10290139499).

51450697465 is a wasteful number, since it uses less digits than its factorization.

51450697465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10290139498.

The product of its (nonzero) digits is 4536000, while the sum is 52.

The spelling of 51450697465 in words is "fifty-one billion, four hundred fifty million, six hundred ninety-seven thousand, four hundred sixty-five".