661362098154 has 16 divisors (see below), whose sum is σ = 1327499377248. Its totient is φ = 219658169232.

The previous prime is 661362098153. The next prime is 661362098261. The reversal of 661362098154 is 451890263166.

It is a super-2 number, since 2×661362098154² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 661362098097 and 661362098106.

It is not an unprimeable number, because it can be changed into a prime (661362098153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198964072 + ... + 198967395.

It is an arithmetic number, because the mean of its divisors is an integer number (82968711078).

Almost surely, 2^661362098154 is an apocalyptic number.

661362098154 is an abundant number, since it is smaller than the sum of its proper divisors (666137279094).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661362098154 is a wasteful number, since it uses less digits than its factorization.

661362098154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397931749.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 661362098154 in words is "six hundred sixty-one billion, three hundred sixty-two million, ninety-eight thousand, one hundred fifty-four".