39955197555 has 144 divisors (see below), whose sum is σ = 87003169344. Its totient is φ = 16812956160.

The previous prime is 39955197521. The next prime is 39955197587. The reversal of 39955197555 is 55579155993.

39955197555 is a `hidden beast` number, since 3 + 9 + 9 + 551 + 9 + 75 + 5 + 5 = 666.

It is not a de Polignac number, because 39955197555 - 2¹³ = 39955189363 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 39955197492 and 39955197501.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 11378250 + ... + 11381760.

It is an arithmetic number, because the mean of its divisors is an integer number (604188676).

Almost surely, 2^39955197555 is an apocalyptic number.

39955197555 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

39955197555 is an abundant number, since it is smaller than the sum of its proper divisors (47047971789).

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

39955197555 is a wasteful number, since it uses less digits than its factorization.

39955197555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3946 (or 3936 counting only the distinct ones).

The product of its digits is 47840625, while the sum is 63.

The spelling of 39955197555 in words is "thirty-nine billion, nine hundred fifty-five million, one hundred ninety-seven thousand, five hundred fifty-five".