55785651639 has 8 divisors (see below), whose sum is σ = 74948662272. Its totient is φ = 36906537720.

The previous prime is 55785651617. The next prime is 55785651641. The reversal of 55785651639 is 93615658755.

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 55785651639 - 2¹⁵ = 55785618871 is a prime.

It is a super-2 number, since 2×55785651639² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55785651659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70973719 + ... + 70974504.

It is an arithmetic number, because the mean of its divisors is an integer number (9368582784).

Almost surely, 2^55785651639 is an apocalyptic number.

55785651639 is a deficient number, since it is larger than the sum of its proper divisors (19163010633).

55785651639 is a wasteful number, since it uses less digits than its factorization.

55785651639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141948357.

The product of its digits is 34020000, while the sum is 60.

The spelling of 55785651639 in words is "fifty-five billion, seven hundred eighty-five million, six hundred fifty-one thousand, six hundred thirty-nine".