3971662231508 has 48 divisors (see below), whose sum is σ = 7354247780880. Its totient is φ = 1873857183744.

The previous prime is 3971662231507. The next prime is 3971662231583. The reversal of 3971662231508 is 8051322661793.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 435201451204 + 3536460780304 = 659698^2 + 1880548^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 3971662231508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971662231507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 323210 + ... + 2836862.

It is an arithmetic number, because the mean of its divisors is an integer number (153213495435).

Almost surely, 2^{3971662231508} is an apocalyptic number.

It is an amenable number.

3971662231508 is a deficient number, since it is larger than the sum of its proper divisors (3382585549372).

3971662231508 is a wasteful number, since it uses less digits than its factorization.

3971662231508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2513996 (or 2513994 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 53.

The spelling of 3971662231508 in words is "three trillion, nine hundred seventy-one billion, six hundred sixty-two million, two hundred thirty-one thousand, five hundred eight".