39978788555 has 8 divisors (see below), whose sum is σ = 48151575744. Its totient is φ = 31865011200.

The previous prime is 39978788537. The next prime is 39978788609. The reversal of 39978788555 is 55588787993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 39978788555 - 2⁶ = 39978788491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14750966 + ... + 14753675.

It is an arithmetic number, because the mean of its divisors is an integer number (6018946968).

Almost surely, 2^39978788555 is an apocalyptic number.

39978788555 is a deficient number, since it is larger than the sum of its proper divisors (8172787189).

39978788555 is a wasteful number, since it uses less digits than its factorization.

39978788555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29504917.

The product of its digits is 762048000, while the sum is 74.

The spelling of 39978788555 in words is "thirty-nine billion, nine hundred seventy-eight million, seven hundred eighty-eight thousand, five hundred fifty-five".