54991651782 has 32 divisors (see below), whose sum is σ = 117927014400. Its totient is φ = 17033897088.

The previous prime is 54991651753. The next prime is 54991651787. The reversal of 54991651782 is 28715619945.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54991651787) 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, 3404182 + ... + 3420297.

It is an arithmetic number, because the mean of its divisors is an integer number (3685219200).

Almost surely, 2^54991651782 is an apocalyptic number.

54991651782 is an abundant number, since it is smaller than the sum of its proper divisors (62935362618).

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

54991651782 is a wasteful number, since it uses less digits than its factorization.

54991651782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6824580.

The product of its digits is 5443200, while the sum is 57.

The spelling of 54991651782 in words is "fifty-four billion, nine hundred ninety-one million, six hundred fifty-one thousand, seven hundred eighty-two".