651240340503640 has 32 divisors (see below), whose sum is σ = 1474623828352080. Its totient is φ = 258836925140352.

The previous prime is 651240340503619. The next prime is 651240340503679. The reversal of 651240340503640 is 46305043042156.

It is a happy number.

It is a super-2 number, since 2×651240340503640² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51850339302 + ... + 51850351861.

Almost surely, 2^{651240340503640} is an apocalyptic number.

It is an amenable number.

651240340503640 is an abundant number, since it is smaller than the sum of its proper divisors (823383487848440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651240340503640 is a wasteful number, since it uses less digits than its factorization.

651240340503640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103700691331 (or 103700691327 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 43.

Adding to 651240340503640 its reverse (46305043042156), we get a palindrome (697545383545796).

The spelling of 651240340503640 in words is "six hundred fifty-one trillion, two hundred forty billion, three hundred forty million, five hundred three thousand, six hundred forty".