85438620691 has 4 divisors (see below), whose sum is σ = 87050670192. Its totient is φ = 83826571192.

The previous prime is 85438620667. The next prime is 85438620721. The reversal of 85438620691 is 19602683458.

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 85438620691 - 2²¹ = 85436523539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85438627691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806024671 + ... + 806024776.

It is an arithmetic number, because the mean of its divisors is an integer number (21762667548).

Almost surely, 2^85438620691 is an apocalyptic number.

85438620691 is a deficient number, since it is larger than the sum of its proper divisors (1612049501).

85438620691 is a wasteful number, since it uses less digits than its factorization.

85438620691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612049500.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 85438620691 in words is "eighty-five billion, four hundred thirty-eight million, six hundred twenty thousand, six hundred ninety-one".