401689394555 has 32 divisors (see below), whose sum is σ = 549752168448. Its totient is φ = 279966297600.

The previous prime is 401689394503. The next prime is 401689394581. The reversal of 401689394555 is 555493986104.

It is a happy number.

It is not a de Polignac number, because 401689394555 - 2¹⁰ = 401689393531 is a prime.

It is a super-2 number, since 2×401689394555² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401689394494 and 401689394503.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3253391 + ... + 3374600.

It is an arithmetic number, because the mean of its divisors is an integer number (17179755264).

Almost surely, 2^401689394555 is an apocalyptic number.

401689394555 is a deficient number, since it is larger than the sum of its proper divisors (148062773893).

401689394555 is a wasteful number, since it uses less digits than its factorization.

401689394555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628067.

The product of its (nonzero) digits is 23328000, while the sum is 59.

The spelling of 401689394555 in words is "four hundred one billion, six hundred eighty-nine million, three hundred ninety-four thousand, five hundred fifty-five".