401786391651 has 8 divisors (see below), whose sum is σ = 536589114960. Its totient is φ = 267420631392.

The previous prime is 401786391637. The next prime is 401786391661. The reversal of 401786391651 is 156193687104.

It is a happy number.

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

It is not a de Polignac number, because 401786391651 - 2¹⁰ = 401786390627 is a prime.

It is a super-2 number, since 2×401786391651² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 401786391594 and 401786391603.

It is not an unprimeable number, because it can be changed into a prime (401786391631) 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, 109238616 + ... + 109242293.

It is an arithmetic number, because the mean of its divisors is an integer number (67073639370).

Almost surely, 2^401786391651 is an apocalyptic number.

401786391651 is a deficient number, since it is larger than the sum of its proper divisors (134802723309).

401786391651 is a wasteful number, since it uses less digits than its factorization.

401786391651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218481525.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 401786391651 in words is "four hundred one billion, seven hundred eighty-six million, three hundred ninety-one thousand, six hundred fifty-one".