1666440996370 has 16 divisors (see below), whose sum is σ = 2999699163648. Its totient is φ = 666552982960.

The previous prime is 1666440996307. The next prime is 1666440996383. The reversal of 1666440996370 is 736990446661.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1666440996299 and 1666440996308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2626576 + ... + 3198715.

It is an arithmetic number, because the mean of its divisors is an integer number (187481197728).

Almost surely, 2^{1666440996370} is an apocalyptic number.

1666440996370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666440996370 is a deficient number, since it is larger than the sum of its proper divisors (1333258167278).

1666440996370 is a wasteful number, since it uses less digits than its factorization.

1666440996370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5853905.

The product of its (nonzero) digits is 35271936, while the sum is 61.

The spelling of 1666440996370 in words is "one trillion, six hundred sixty-six billion, four hundred forty million, nine hundred ninety-six thousand, three hundred seventy".