63400261656 has 64 divisors (see below), whose sum is σ = 161980197120. Its totient is φ = 20671896960.

The previous prime is 63400261649. The next prime is 63400261657. The reversal of 63400261656 is 65616200436.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63400261657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345741 + ... + 496323.

It is an arithmetic number, because the mean of its divisors is an integer number (2530940580).

Almost surely, 2^63400261656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63400261656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80990098560).

63400261656 is an abundant number, since it is smaller than the sum of its proper divisors (98579935464).

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

63400261656 is a wasteful number, since it uses less digits than its factorization.

63400261656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150976 (or 150972 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 63400261656 in words is "sixty-three billion, four hundred million, two hundred sixty-one thousand, six hundred fifty-six".