1961180594551 has 2 divisors, whose sum is σ = 1961180594552. Its totient is φ = 1961180594550.

The previous prime is 1961180594497. The next prime is 1961180594587. The reversal of 1961180594551 is 1554950811691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1961180594551 - 2³³ = 1952590659959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1961180594492 and 1961180594501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961180592551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980590297275 + 980590297276.

It is an arithmetic number, because the mean of its divisors is an integer number (980590297276).

Almost surely, 2^{1961180594551} is an apocalyptic number.

1961180594551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961180594551 is an equidigital number, since it uses as much as digits as its factorization.

1961180594551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 55.

The spelling of 1961180594551 in words is "one trillion, nine hundred sixty-one billion, one hundred eighty million, five hundred ninety-four thousand, five hundred fifty-one".