125777837639 has 4 divisors (see below), whose sum is σ = 125850923520. Its totient is φ = 125704751760.

The previous prime is 125777837611. The next prime is 125777837671. The reversal of 125777837639 is 936738777521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 125777837639 - 2¹⁶ = 125777772103 is a prime.

It is a super-2 number, since 2×125777837639² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125777837609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36540359 + ... + 36543800.

It is an arithmetic number, because the mean of its divisors is an integer number (31462730880).

Almost surely, 2^125777837639 is an apocalyptic number.

125777837639 is a deficient number, since it is larger than the sum of its proper divisors (73085881).

125777837639 is an equidigital number, since it uses as much as digits as its factorization.

125777837639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73085880.

The product of its digits is 93350880, while the sum is 65.

The spelling of 125777837639 in words is "one hundred twenty-five billion, seven hundred seventy-seven million, eight hundred thirty-seven thousand, six hundred thirty-nine".