39661580820 has 24 divisors (see below), whose sum is σ = 111052426464. Its totient is φ = 10576421536.

The previous prime is 39661580813. The next prime is 39661580821. The reversal of 39661580820 is 2808516693.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 39661580820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39661580821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330513114 + ... + 330513233.

It is an arithmetic number, because the mean of its divisors is an integer number (4627184436).

Almost surely, 2^39661580820 is an apocalyptic number.

39661580820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

39661580820 is an abundant number, since it is smaller than the sum of its proper divisors (71390845644).

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

39661580820 is a wasteful number, since it uses less digits than its factorization.

39661580820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661026359 (or 661026357 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 39661580820 in words is "thirty-nine billion, six hundred sixty-one million, five hundred eighty thousand, eight hundred twenty".