1961658500026 has 16 divisors (see below), whose sum is σ = 3071555673480. Its totient is φ = 938675753280.

The previous prime is 1961658500017. The next prime is 1961658500129. The reversal of 1961658500026 is 6200058561691.

It can be written as a sum of positive squares in 4 ways, for example, as 1717014501801 + 244643998225 = 1310349^2 + 494615^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217281541 + ... + 217290568.

Almost surely, 2^{1961658500026} is an apocalyptic number.

1961658500026 is a deficient number, since it is larger than the sum of its proper divisors (1109897173454).

1961658500026 is a wasteful number, since it uses less digits than its factorization.

1961658500026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434572209.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 1961658500026 in words is "one trillion, nine hundred sixty-one billion, six hundred fifty-eight million, five hundred thousand, twenty-six".