1961954770238 has 48 divisors (see below), whose sum is σ = 3046189189680. Its totient is φ = 947439131520.

The previous prime is 1961954770231. The next prime is 1961954770247. The reversal of 1961954770238 is 8320774591691.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1961954770231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174281906 + ... + 174293162.

It is an arithmetic number, because the mean of its divisors is an integer number (63462274785).

It is a 1-persistent number, because it is pandigital, but 2⋅1961954770238 = 3923909540476 is not.

Almost surely, 2^{1961954770238} is an apocalyptic number.

1961954770238 is a deficient number, since it is larger than the sum of its proper divisors (1084234419442).

1961954770238 is a wasteful number, since it uses less digits than its factorization.

1961954770238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11753 (or 11682 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 62.

The spelling of 1961954770238 in words is "one trillion, nine hundred sixty-one billion, nine hundred fifty-four million, seven hundred seventy thousand, two hundred thirty-eight".