651271406722 has 4 divisors (see below), whose sum is σ = 976907110086. Its totient is φ = 325635703360.

The previous prime is 651271406651. The next prime is 651271406743. The reversal of 651271406722 is 227604172156.

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

It can be written as a sum of positive squares in only one way, i.e., 454358231721 + 196913175001 = 674061^2 + 443749^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162817851679 + ... + 162817851682.

Almost surely, 2^651271406722 is an apocalyptic number.

651271406722 is a deficient number, since it is larger than the sum of its proper divisors (325635703364).

651271406722 is a wasteful number, since it uses less digits than its factorization.

651271406722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325635703363.

The product of its (nonzero) digits is 282240, while the sum is 43.

Adding to 651271406722 its reverse (227604172156), we get a palindrome (878875578878).

The spelling of 651271406722 in words is "six hundred fifty-one billion, two hundred seventy-one million, four hundred six thousand, seven hundred twenty-two".