661075701211 has 8 divisors (see below), whose sum is σ = 665175661920. Its totient is φ = 656977424448.

The previous prime is 661075701137. The next prime is 661075701217. The reversal of 661075701211 is 112107570166.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661075701211 - 2²⁹ = 660538830299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661075701217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371205 + ... + 1208281.

It is an arithmetic number, because the mean of its divisors is an integer number (83146957740).

Almost surely, 2^661075701211 is an apocalyptic number.

661075701211 is a deficient number, since it is larger than the sum of its proper divisors (4099960709).

661075701211 is a wasteful number, since it uses less digits than its factorization.

661075701211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841973.

The product of its (nonzero) digits is 17640, while the sum is 37.

The spelling of 661075701211 in words is "six hundred sixty-one billion, seventy-five million, seven hundred one thousand, two hundred eleven".