651421155531 has 16 divisors (see below), whose sum is σ = 886805168256. Its totient is φ = 425251564416.

The previous prime is 651421155467. The next prime is 651421155569. The reversal of 651421155531 is 135551124156.

651421155531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 651421155531 - 2⁶ = 651421155467 is a prime.

It is a super-2 number, since 2×651421155531² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 651421155531.

It is not an unprimeable number, because it can be changed into a prime (651421155131) 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, 11547745 + ... + 11604018.

It is an arithmetic number, because the mean of its divisors is an integer number (55425323016).

Almost surely, 2^651421155531 is an apocalyptic number.

651421155531 is a deficient number, since it is larger than the sum of its proper divisors (235384012725).

651421155531 is a wasteful number, since it uses less digits than its factorization.

651421155531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23151962.

The product of its digits is 90000, while the sum is 39.

Adding to 651421155531 its reverse (135551124156), we get a palindrome (786972279687).

The spelling of 651421155531 in words is "six hundred fifty-one billion, four hundred twenty-one million, one hundred fifty-five thousand, five hundred thirty-one".