61439400127 has 4 divisors (see below), whose sum is σ = 70216457296. Its totient is φ = 52662342960.

The previous prime is 61439400097. The next prime is 61439400131. The reversal of 61439400127 is 72100493416.

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 61439400127 - 2¹⁵ = 61439367359 is a prime.

It is a super-2 number, since 2×61439400127² (a number of 22 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 (61439400157) 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, 4388528574 + ... + 4388528587.

It is an arithmetic number, because the mean of its divisors is an integer number (17554114324).

Almost surely, 2^61439400127 is an apocalyptic number.

61439400127 is a deficient number, since it is larger than the sum of its proper divisors (8777057169).

61439400127 is an equidigital number, since it uses as much as digits as its factorization.

61439400127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8777057168.

The product of its (nonzero) digits is 36288, while the sum is 37.

The spelling of 61439400127 in words is "sixty-one billion, four hundred thirty-nine million, four hundred thousand, one hundred twenty-seven".