84866421951 has 8 divisors (see below), whose sum is σ = 125728032560. Its totient is φ = 56577614616.

The previous prime is 84866421919. The next prime is 84866421977. The reversal of 84866421951 is 15912466848.

It is not a de Polignac number, because 84866421951 - 2⁵ = 84866421919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84866421751) 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, 1571600380 + ... + 1571600433.

It is an arithmetic number, because the mean of its divisors is an integer number (15716004070).

Almost surely, 2^84866421951 is an apocalyptic number.

84866421951 is a deficient number, since it is larger than the sum of its proper divisors (40861610609).

84866421951 is a wasteful number, since it uses less digits than its factorization.

84866421951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3143200822 (or 3143200816 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 54.

The spelling of 84866421951 in words is "eighty-four billion, eight hundred sixty-six million, four hundred twenty-one thousand, nine hundred fifty-one".