61878813654 has 128 divisors (see below), whose sum is σ = 152570880000. Its totient is φ = 16335260928.

The previous prime is 61878813589. The next prime is 61878813779. The reversal of 61878813654 is 45631887816.

It is a happy number.

61878813654 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61878813594 and 61878813603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44230047 + ... + 44231445.

It is an arithmetic number, because the mean of its divisors is an integer number (1191960000).

Almost surely, 2^61878813654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61878813654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76285440000).

61878813654 is an abundant number, since it is smaller than the sum of its proper divisors (90692066346).

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

61878813654 is a wasteful number, since it uses less digits than its factorization.

61878813654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2762.

The product of its digits is 7741440, while the sum is 57.

The spelling of 61878813654 in words is "sixty-one billion, eight hundred seventy-eight million, eight hundred thirteen thousand, six hundred fifty-four".