1961581002311 has 64 divisors (see below), whose sum is σ = 2431680362496. Its totient is φ = 1544301158400.

The previous prime is 1961581002307. The next prime is 1961581002313. The reversal of 1961581002311 is 1132001851691.

It is not a de Polignac number, because 1961581002311 - 2² = 1961581002307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961581002313) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 479250581 + ... + 479254673.

It is an arithmetic number, because the mean of its divisors is an integer number (37995005664).

Almost surely, 2^{1961581002311} is an apocalyptic number.

1961581002311 is a deficient number, since it is larger than the sum of its proper divisors (470099360185).

1961581002311 is a wasteful number, since it uses less digits than its factorization.

1961581002311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752.

The product of its (nonzero) digits is 12960, while the sum is 38.

The spelling of 1961581002311 in words is "one trillion, nine hundred sixty-one billion, five hundred eighty-one million, two thousand, three hundred eleven".