61392928187 has 4 divisors (see below), whose sum is σ = 62309240616. Its totient is φ = 60476615760.

The previous prime is 61392928169. The next prime is 61392928243. The reversal of 61392928187 is 78182929316.

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 61392928187 - 2⁶ = 61392928123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61392948187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458156114 + ... + 458156247.

It is an arithmetic number, because the mean of its divisors is an integer number (15577310154).

Almost surely, 2^61392928187 is an apocalyptic number.

61392928187 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

61392928187 is a deficient number, since it is larger than the sum of its proper divisors (916312429).

61392928187 is an equidigital number, since it uses as much as digits as its factorization.

61392928187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916312428.

The product of its digits is 2612736, while the sum is 56.

The spelling of 61392928187 in words is "sixty-one billion, three hundred ninety-two million, nine hundred twenty-eight thousand, one hundred eighty-seven".