1039661398776 has 512 divisors, whose sum is σ = 3673948078080. Its totient is φ = 236307456000.

The previous prime is 1039661398733. The next prime is 1039661398793. The reversal of 1039661398776 is 6778931669301.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 62430051 + ... + 62446701.

It is an arithmetic number, because the mean of its divisors is an integer number (7175679840).

Almost surely, 2^{1039661398776} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1039661398776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1836974039040).

1039661398776 is an abundant number, since it is smaller than the sum of its proper divisors (2634286679304).

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

1039661398776 is a wasteful number, since it uses less digits than its factorization.

1039661398776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16827 (or 16823 counting only the distinct ones).

The product of its (nonzero) digits is 61725888, while the sum is 66.

The spelling of 1039661398776 in words is "one trillion, thirty-nine billion, six hundred sixty-one million, three hundred ninety-eight thousand, seven hundred seventy-six".