61908694490 has 16 divisors (see below), whose sum is σ = 111444386760. Its totient is φ = 24761536320.

The previous prime is 61908694481. The next prime is 61908694499. The reversal of 61908694490 is 9449680916.

It is an interprime number because it is at equal distance from previous prime (61908694481) and next prime (61908694499).

It can be written as a sum of positive squares in 4 ways, for example, as 25535720401 + 36372974089 = 159799^2 + 190717^2 .

It is not an unprimeable number, because it can be changed into a prime (61908694499) 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, 105041 + ... + 367220.

Almost surely, 2^61908694490 is an apocalyptic number.

61908694490 is a deficient number, since it is larger than the sum of its proper divisors (49535692270).

61908694490 is a wasteful number, since it uses less digits than its factorization.

61908694490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485377.

The product of its (nonzero) digits is 3359232, while the sum is 56.

The spelling of 61908694490 in words is "sixty-one billion, nine hundred eight million, six hundred ninety-four thousand, four hundred ninety".