661034011441251 has 8 divisors (see below), whose sum is σ = 1007289922196224. Its totient is φ = 377733720823560.

The previous prime is 661034011441163. The next prime is 661034011441267. The reversal of 661034011441251 is 152144110430166.

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

It is not a de Polignac number, because 661034011441251 - 2⁷ = 661034011441123 is a prime.

It is a super-2 number, since 2×661034011441251² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661034011443251) 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, 15738905034295 + ... + 15738905034336.

It is an arithmetic number, because the mean of its divisors is an integer number (125911240274528).

Almost surely, 2^{661034011441251} is an apocalyptic number.

661034011441251 is a deficient number, since it is larger than the sum of its proper divisors (346255910754973).

661034011441251 is a wasteful number, since it uses less digits than its factorization.

661034011441251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31477810068641.

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 661034011441251 in words is "six hundred sixty-one trillion, thirty-four billion, eleven million, four hundred forty-one thousand, two hundred fifty-one".