197957936650 has 12 divisors (see below), whose sum is σ = 368201762262. Its totient is φ = 79183174640.

The previous prime is 197957936641. The next prime is 197957936711. The reversal of 197957936650 is 56639759791.

It can be written as a sum of positive squares in 3 ways, for example, as 148970525089 + 48987411561 = 385967^2 + 221331^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1979579317 + ... + 1979579416.

Almost surely, 2^197957936650 is an apocalyptic number.

197957936650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197957936650 is a deficient number, since it is larger than the sum of its proper divisors (170243825612).

197957936650 is a wasteful number, since it uses less digits than its factorization.

197957936650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959158745 (or 3959158740 counting only the distinct ones).

The product of its (nonzero) digits is 96446700, while the sum is 67.

The spelling of 197957936650 in words is "one hundred ninety-seven billion, nine hundred fifty-seven million, nine hundred thirty-six thousand, six hundred fifty".