3309506697861 has 168 divisors, whose sum is σ = 6147988803456. Its totient is φ = 1743579976320.

The previous prime is 3309506697841. The next prime is 3309506697863. The reversal of 3309506697861 is 1687966059033.

3309506697861 is a `hidden beast` number, since 3 + 3 + 0 + 9 + 506 + 69 + 7 + 8 + 61 = 666.

It is a Wieferich number.

It is not a de Polignac number, because 3309506697861 - 2⁵ = 3309506697829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3309506697863) by changing a digit.

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 in 167 ways as a sum of consecutive naturals, for example, 942609096 + ... + 942612606.

Almost surely, 2^{3309506697861} is an apocalyptic number.

It is an amenable number.

3309506697861 is a deficient number, since it is larger than the sum of its proper divisors (2838482105595).

3309506697861 is a wasteful number, since it uses less digits than its factorization.

3309506697861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4655 (or 4627 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 63.

The spelling of 3309506697861 in words is "three trillion, three hundred nine billion, five hundred six million, six hundred ninety-seven thousand, eight hundred sixty-one".