1661392346837 has 8 divisors (see below), whose sum is σ = 1714905827712. Its totient is φ = 1608497519200.

The previous prime is 1661392346827. The next prime is 1661392346879. The reversal of 1661392346837 is 7386432931661.

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

It is a cyclic number.

It is not a de Polignac number, because 1661392346837 - 2¹⁶ = 1661392281301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661392346807) 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, 154657853 + ... + 154668594.

It is an arithmetic number, because the mean of its divisors is an integer number (214363228464).

Almost surely, 2^{1661392346837} is an apocalyptic number.

It is an amenable number.

1661392346837 is a deficient number, since it is larger than the sum of its proper divisors (53513480875).

1661392346837 is a wasteful number, since it uses less digits than its factorization.

1661392346837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309326619.

The product of its digits is 23514624, while the sum is 59.

The spelling of 1661392346837 in words is "one trillion, six hundred sixty-one billion, three hundred ninety-two million, three hundred forty-six thousand, eight hundred thirty-seven".