61869322178891 has 8 divisors (see below), whose sum is σ = 64560767951520. Its totient is φ = 59177999343232.

The previous prime is 61869322178887. The next prime is 61869322178933. The reversal of 61869322178891 is 19887122396816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61869322178891 - 2² = 61869322178887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61869322178801) 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, 29705096 + ... + 31719573.

It is an arithmetic number, because the mean of its divisors is an integer number (8070095993940).

Almost surely, 2^{61869322178891} is an apocalyptic number.

61869322178891 is a deficient number, since it is larger than the sum of its proper divisors (2691445772629).

61869322178891 is a wasteful number, since it uses less digits than its factorization.

61869322178891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61468485.

The product of its digits is 125411328, while the sum is 71.

The spelling of 61869322178891 in words is "sixty-one trillion, eight hundred sixty-nine billion, three hundred twenty-two million, one hundred seventy-eight thousand, eight hundred ninety-one".