661840374362 has 16 divisors (see below), whose sum is σ = 1004755957632. Its totient is φ = 326921995200.

The previous prime is 661840374287. The next prime is 661840374367. The reversal of 661840374362 is 263473048166.

It is a super-2 number, since 2×661840374362² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 661840374362.

It is not an unprimeable number, because it can be changed into a prime (661840374367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6967487 + ... + 7061837.

It is an arithmetic number, because the mean of its divisors is an integer number (62797247352).

Almost surely, 2^661840374362 is an apocalyptic number.

661840374362 is a deficient number, since it is larger than the sum of its proper divisors (342915583270).

661840374362 is a wasteful number, since it uses less digits than its factorization.

661840374362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136693.

The product of its (nonzero) digits is 3483648, while the sum is 50.

The spelling of 661840374362 in words is "six hundred sixty-one billion, eight hundred forty million, three hundred seventy-four thousand, three hundred sixty-two".