690721372321 has 8 divisors (see below), whose sum is σ = 713013476864. Its totient is φ = 668429940960.

The previous prime is 690721372307. The next prime is 690721372349. The reversal of 690721372321 is 123273127096.

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

It is not a de Polignac number, because 690721372321 - 2³⁷ = 553282418849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690721322321) 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, 2685085 + ... + 2931061.

It is an arithmetic number, because the mean of its divisors is an integer number (89126684608).

Almost surely, 2^690721372321 is an apocalyptic number.

It is an amenable number.

690721372321 is a deficient number, since it is larger than the sum of its proper divisors (22292104543).

690721372321 is a wasteful number, since it uses less digits than its factorization.

690721372321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336591.

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 690721372321 in words is "six hundred ninety billion, seven hundred twenty-one million, three hundred seventy-two thousand, three hundred twenty-one".