85721503734 has 12 divisors (see below), whose sum is σ = 185729924796. Its totient is φ = 28573834572.

The previous prime is 85721503711. The next prime is 85721503741. The reversal of 85721503734 is 43730512758.

85721503734 is a `hidden beast` number, since 8 + 5 + 72 + 1 + 503 + 73 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 85721503734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2381152864 + ... + 2381152899.

It is an arithmetic number, because the mean of its divisors is an integer number (15477493733).

Almost surely, 2^85721503734 is an apocalyptic number.

85721503734 is an abundant number, since it is smaller than the sum of its proper divisors (100008421062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85721503734 is a wasteful number, since it uses less digits than its factorization.

85721503734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4762305771 (or 4762305768 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The spelling of 85721503734 in words is "eighty-five billion, seven hundred twenty-one million, five hundred three thousand, seven hundred thirty-four".