651561656148 has 72 divisors (see below), whose sum is σ = 1878030678888. Its totient is φ = 188687536128.

The previous prime is 651561656143. The next prime is 651561656177. The reversal of 651561656148 is 841656165156.

It is a happy number.

651561656148 is a `hidden beast` number, since 6 + 5 + 1 + 5 + 6 + 16 + 5 + 614 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 129543846084 + 522017810064 = 359922^2 + 722508^2 .

It is a junction number, because it is equal to n+sod(n) for n = 651561656094 and 651561656103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651561656143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40939861 + ... + 40955772.

It is an arithmetic number, because the mean of its divisors is an integer number (26083759429).

Almost surely, 2^651561656148 is an apocalyptic number.

651561656148 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

651561656148 is an abundant number, since it is smaller than the sum of its proper divisors (1226469022740).

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

651561656148 is a wasteful number, since it uses less digits than its factorization.

651561656148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81895673 (or 81895668 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 54.

The spelling of 651561656148 in words is "six hundred fifty-one billion, five hundred sixty-one million, six hundred fifty-six thousand, one hundred forty-eight".