61275136668 has 24 divisors (see below), whose sum is σ = 151385632272. Its totient is φ = 19223572224.

The previous prime is 61275136613. The next prime is 61275136669. The reversal of 61275136668 is 86663157216.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 61275136668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61275136669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150183955 + ... + 150184362.

It is an arithmetic number, because the mean of its divisors is an integer number (6307734678).

Almost surely, 2^61275136668 is an apocalyptic number.

61275136668 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

61275136668 is an abundant number, since it is smaller than the sum of its proper divisors (90110495604).

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

61275136668 is a wasteful number, since it uses less digits than its factorization.

61275136668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300368341 (or 300368339 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The spelling of 61275136668 in words is "sixty-one billion, two hundred seventy-five million, one hundred thirty-six thousand, six hundred sixty-eight".