690506231553 has 12 divisors (see below), whose sum is σ = 999079850340. Its totient is φ = 459561198336.

The previous prime is 690506231543. The next prime is 690506231563. The reversal of 690506231553 is 355132605096.

690506231553 is a `hidden beast` number, since 6 + 9 + 0 + 5 + 0 + 62 + 31 + 553 = 666.

It is an interprime number because it is at equal distance from previous prime (690506231543) and next prime (690506231563).

It can be written as a sum of positive squares in 2 ways, for example, as 539956023489 + 150550208064 = 734817^2 + 388008^2 .

It is not a de Polignac number, because 690506231553 - 2¹² = 690506227457 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 690506231499 and 690506231508.

It is not an unprimeable number, because it can be changed into a prime (690506231543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64685148 + ... + 64695821.

It is an arithmetic number, because the mean of its divisors is an integer number (83256654195).

Almost surely, 2^690506231553 is an apocalyptic number.

It is an amenable number.

690506231553 is a deficient number, since it is larger than the sum of its proper divisors (308573618787).

690506231553 is a wasteful number, since it uses less digits than its factorization.

690506231553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129381568 (or 129381565 counting only the distinct ones).

The product of its (nonzero) digits is 729000, while the sum is 45.

The spelling of 690506231553 in words is "six hundred ninety billion, five hundred six million, two hundred thirty-one thousand, five hundred fifty-three".