400000666734 has 48 divisors (see below), whose sum is σ = 894711826944. Its totient is φ = 129019971600.

The previous prime is 400000666721. The next prime is 400000666739. The reversal of 400000666734 is 437666000004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400000666739) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7008517 + ... + 7065359.

It is an arithmetic number, because the mean of its divisors is an integer number (18639829728).

Almost surely, 2^400000666734 is an apocalyptic number.

400000666734 is an abundant number, since it is smaller than the sum of its proper divisors (494711160210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400000666734 is a wasteful number, since it uses less digits than its factorization.

400000666734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69493 (or 69490 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

Adding to 400000666734 its reverse (437666000004), we get a palindrome (837666666738).

The spelling of 400000666734 in words is "four hundred billion, six hundred sixty-six thousand, seven hundred thirty-four".