3913007991556 has 6 divisors (see below), whose sum is σ = 6847763985230. Its totient is φ = 1956503995776.

The previous prime is 3913007991547. The next prime is 3913007991631. The reversal of 3913007991556 is 6551997003193.

It can be written as a sum of positive squares in only one way, i.e., 3886693960900 + 26314030656 = 1971470^2 + 162216^2 .

It is a super-2 number, since 2×3913007991556² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3913007991556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 489125998941 + ... + 489125998948.

Almost surely, 2^{3913007991556} is an apocalyptic number.

It is an amenable number.

3913007991556 is a deficient number, since it is larger than the sum of its proper divisors (2934755993674).

3913007991556 is a wasteful number, since it uses less digits than its factorization.

3913007991556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978251997893 (or 978251997891 counting only the distinct ones).

The product of its (nonzero) digits is 6889050, while the sum is 58.

The spelling of 3913007991556 in words is "three trillion, nine hundred thirteen billion, seven million, nine hundred ninety-one thousand, five hundred fifty-six".