661900145007 has 8 divisors (see below), whose sum is σ = 882572943280. Its totient is φ = 441247055040.

The previous prime is 661900144981. The next prime is 661900145131. The reversal of 661900145007 is 700541009166.

661900145007 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 661900145007 - 2⁶ = 661900144943 is a prime.

It is a super-2 number, since 2×661900145007² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661900135007) 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, 4848532 + ... + 4983177.

It is an arithmetic number, because the mean of its divisors is an integer number (110321617910).

Almost surely, 2^661900145007 is an apocalyptic number.

661900145007 is a deficient number, since it is larger than the sum of its proper divisors (220672798273).

661900145007 is a wasteful number, since it uses less digits than its factorization.

661900145007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9854153.

The product of its (nonzero) digits is 45360, while the sum is 39.

The spelling of 661900145007 in words is "six hundred sixty-one billion, nine hundred million, one hundred forty-five thousand, seven".