1690994990961 has 6 divisors (see below), whose sum is σ = 2442548320290. Its totient is φ = 1127329993968.

The previous prime is 1690994990957. The next prime is 1690994990969.

1690994990961 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 1687190568561 + 3804422400 = 1298919^2 + 61680^2 .

It is not a de Polignac number, because 1690994990961 - 2² = 1690994990957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1690994990961.

It is not an unprimeable number, because it can be changed into a prime (1690994990969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 93944166156 + ... + 93944166173.

It is an arithmetic number, because the mean of its divisors is an integer number (407091386715).

Almost surely, 2^{1690994990961} is an apocalyptic number.

It is an amenable number.

1690994990961 is a deficient number, since it is larger than the sum of its proper divisors (751553329329).

1690994990961 is a wasteful number, since it uses less digits than its factorization.

1690994990961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187888332335 (or 187888332332 counting only the distinct ones).

The product of its (nonzero) digits is 76527504, while the sum is 72.

The spelling of 1690994990961 in words is "one trillion, six hundred ninety billion, nine hundred ninety-four million, nine hundred ninety thousand, nine hundred sixty-one".