85421007657 has 6 divisors (see below), whose sum is σ = 123385899962. Its totient is φ = 56947338432.

The previous prime is 85421007647. The next prime is 85421007677. The reversal of 85421007657 is 75670012458.

It can be written as a sum of positive squares in only one way, i.e., 76361584896 + 9059422761 = 276336^2 + 95181^2 .

It is not a de Polignac number, because 85421007657 - 2⁴ = 85421007641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85421007647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4745611528 + ... + 4745611545.

Almost surely, 2^85421007657 is an apocalyptic number.

It is an amenable number.

85421007657 is a deficient number, since it is larger than the sum of its proper divisors (37964892305).

85421007657 is a wasteful number, since it uses less digits than its factorization.

85421007657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9491223079 (or 9491223076 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The spelling of 85421007657 in words is "eighty-five billion, four hundred twenty-one million, seven thousand, six hundred fifty-seven".