71900649821 has 64 divisors (see below), whose sum is σ = 97387315200. Its totient is φ = 51264057600.

The previous prime is 71900649781. The next prime is 71900649827. The reversal of 71900649821 is 12894600917.

It is not a de Polignac number, because 71900649821 - 2¹⁰ = 71900648797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71900649827) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 64833215 + ... + 64834323.

It is an arithmetic number, because the mean of its divisors is an integer number (1521676800).

Almost surely, 2^71900649821 is an apocalyptic number.

It is an amenable number.

71900649821 is a deficient number, since it is larger than the sum of its proper divisors (25486665379).

71900649821 is a wasteful number, since it uses less digits than its factorization.

71900649821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 71900649821 in words is "seventy-one billion, nine hundred million, six hundred forty-nine thousand, eight hundred twenty-one".