61406440016 has 10 divisors (see below), whose sum is σ = 118974977562. Its totient is φ = 30703220000.

The previous prime is 61406440003. The next prime is 61406440031. The reversal of 61406440016 is 61004460416.

It can be written as a sum of positive squares in only one way, i.e., 52993881616 + 8412558400 = 230204^2 + 91720^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1918951235 + ... + 1918951266.

Almost surely, 2^61406440016 is an apocalyptic number.

It is an amenable number.

61406440016 is a deficient number, since it is larger than the sum of its proper divisors (57568537546).

61406440016 is a wasteful number, since it uses less digits than its factorization.

61406440016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3837902509 (or 3837902503 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The spelling of 61406440016 in words is "sixty-one billion, four hundred six million, four hundred forty thousand, sixteen".