1961990553597 has 8 divisors (see below), whose sum is σ = 2618434544160. Its totient is φ = 1306770132720.

The previous prime is 1961990553581. The next prime is 1961990553613. The reversal of 1961990553597 is 7953550991691.

It is an interprime number because it is at equal distance from previous prime (1961990553581) and next prime (1961990553613).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1961990553597 - 2⁴ = 1961990553581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961990554597) 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, 305888679 + ... + 305895092.

It is an arithmetic number, because the mean of its divisors is an integer number (327304318020).

Almost surely, 2^{1961990553597} is an apocalyptic number.

It is an amenable number.

1961990553597 is a deficient number, since it is larger than the sum of its proper divisors (656443990563).

1961990553597 is a wasteful number, since it uses less digits than its factorization.

1961990553597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611784843.

The product of its (nonzero) digits is 103335750, while the sum is 69.

The spelling of 1961990553597 in words is "one trillion, nine hundred sixty-one billion, nine hundred ninety million, five hundred fifty-three thousand, five hundred ninety-seven".